W
Watson A.Name - \"Watt Su
Guest
I found a seller on Ebay selling GE 5L507 (or X5L507) UJTs, so I tried
to find out their specs, first by clicking on his link to his website.
The only thing he showed was a schematic with the pinout. So I did a
few Google searches for them, and came up with a few hits, all of which
were just distribs or just lists of thousands of part numbers.
I checked the GE Transistor Manual, revised 7th ed. but it doesn't go up
to that high a number in the UJT section. Yesterday I was over to
Bookman used books and I found a Datadex diode manual from 1965, but it
doesn't go that high either. I checked the NTE catalog, but I couldn't
find anything there even close.
Right now, I'm thinking that UJTs are all very similar electrically
except for the package (the Motorola manual has only a single page of
UJTs). And the Intrinsic Standoff Ratio is spec'd at such a wide
tolerance that even between units from the same mfgr and batch, there's
a wide variation. I remember that most projects from the '60s and '70s
used either the 2N489 or the 2N2646, both were TO-5 metal cans I
believe, which makes them high priced. There was also a 2N4891 in a
plastic package, I believe. So using the 5L507 which is (sort of) a
TO-92 plastic package would be a lot more economical. If I only knew
which of the more common UjTs this was closest to. Any ideas? I don't
know of any way to test and measure these, other than to put them into a
working circuit and measure their oscillation freq, etc. Thanks.
--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
to find out their specs, first by clicking on his link to his website.
The only thing he showed was a schematic with the pinout. So I did a
few Google searches for them, and came up with a few hits, all of which
were just distribs or just lists of thousands of part numbers.
I checked the GE Transistor Manual, revised 7th ed. but it doesn't go up
to that high a number in the UJT section. Yesterday I was over to
Bookman used books and I found a Datadex diode manual from 1965, but it
doesn't go that high either. I checked the NTE catalog, but I couldn't
find anything there even close.
Right now, I'm thinking that UJTs are all very similar electrically
except for the package (the Motorola manual has only a single page of
UJTs). And the Intrinsic Standoff Ratio is spec'd at such a wide
tolerance that even between units from the same mfgr and batch, there's
a wide variation. I remember that most projects from the '60s and '70s
used either the 2N489 or the 2N2646, both were TO-5 metal cans I
believe, which makes them high priced. There was also a 2N4891 in a
plastic package, I believe. So using the 5L507 which is (sort of) a
TO-92 plastic package would be a lot more economical. If I only knew
which of the more common UjTs this was closest to. Any ideas? I don't
know of any way to test and measure these, other than to put them into a
working circuit and measure their oscillation freq, etc. Thanks.
--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@